Yes, most of them have negative impact to the crypto ecosystem.
When you tell someone that 99% of ICOs are pure scam, will it make a good impression? I don´t think so.
I think 99 percent are just speculations. in the early stages, we can only understand that 50 percent of the projects will be scammers and another 30 in a year -1.5. I think its very difficult to describe ICO scam statistics now